151561521720 has 288 divisors, whose sum is σ = 581070503520. Its totient is φ = 34154426880.

The previous prime is 151561521719. The next prime is 151561521731. The reversal of 151561521720 is 27125165151.

151561521720 is a `hidden beast` number, since 1 + 5 + 1 + 5 + 61 + 521 + 72 + 0 = 666.

151561521720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1191934 + ... + 1312946.

It is an arithmetic number, because the mean of its divisors is an integer number (2017605915).

Almost surely, 2^151561521720 is an apocalyptic number.

151561521720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 151561521720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290535251760).

151561521720 is an abundant number, since it is smaller than the sum of its proper divisors (429508981800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

151561521720 is a wasteful number, since it uses less digits than its factorization.

151561521720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121115 (or 121101 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 36.

Adding to 151561521720 its reverse (27125165151), we get a palindrome (178686686871).

The spelling of 151561521720 in words is "one hundred fifty-one billion, five hundred sixty-one million, five hundred twenty-one thousand, seven hundred twenty".