61653771270 has 720 divisors, whose sum is σ = 219848661648. Its totient is φ = 12286391040.

The previous prime is 61653771269. The next prime is 61653771287. The reversal of 61653771270 is 7217735616.

61653771270 is a `hidden beast` number, since 6 + 1 + 6 + 5 + 377 + 1 + 270 = 666.

61653771270 is digitally balanced in base 2, 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 (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 359 ways as a sum of consecutive naturals, for example, 186265005 + ... + 186265335.

Almost surely, 2^61653771270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61653771270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109924330824).

61653771270 is an abundant number, since it is smaller than the sum of its proper divisors (158194890378).

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

61653771270 is a wasteful number, since it uses less digits than its factorization.

61653771270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 370440, while the sum is 45.

The spelling of 61653771270 in words is "sixty-one billion, six hundred fifty-three million, seven hundred seventy-one thousand, two hundred seventy".