61523201920 has 64 divisors (see below), whose sum is σ = 148507014240. Its totient is φ = 24370329600.

The previous prime is 61523201911. The next prime is 61523201963. The reversal of 61523201920 is 2910232516.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400731 + ... + 532570.

Almost surely, 2^61523201920 is an apocalyptic number.

It is an amenable number.

61523201920 is an abundant number, since it is smaller than the sum of its proper divisors (86983812320).

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

61523201920 is a wasteful number, since it uses less digits than its factorization.

61523201920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933423 (or 933411 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 61523201920 in words is "sixty-one billion, five hundred twenty-three million, two hundred one thousand, nine hundred twenty".