151551221616 has 200 divisors, whose sum is σ = 450442826064. Its totient is φ = 49174179840.

The previous prime is 151551221611. The next prime is 151551221617. The reversal of 151551221616 is 616122155151.

151551221616 is a `hidden beast` number, since 1 + 5 + 1 + 5 + 5 + 12 + 21 + 616 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151551221611) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7658551 + ... + 7678313.

Almost surely, 2^151551221616 is an apocalyptic number.

151551221616 is a gapful number since it is divisible by the number (16) 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 151551221616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225221413032).

151551221616 is an abundant number, since it is smaller than the sum of its proper divisors (298891604448).

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

151551221616 is a wasteful number, since it uses less digits than its factorization.

151551221616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19941 (or 19926 counting only the distinct ones).

The product of its digits is 18000, while the sum is 36.

Adding to 151551221616 its reverse (616122155151), we get a palindrome (767673376767).

The spelling of 151551221616 in words is "one hundred fifty-one billion, five hundred fifty-one million, two hundred twenty-one thousand, six hundred sixteen".