61520179928 has 8 divisors (see below), whose sum is σ = 115350337380. Its totient is φ = 30760089960.

The previous prime is 61520179907. The next prime is 61520179999. The reversal of 61520179928 is 82997102516.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3845011238 + ... + 3845011253.

Almost surely, 2^61520179928 is an apocalyptic number.

It is an amenable number.

61520179928 is a deficient number, since it is larger than the sum of its proper divisors (53830157452).

61520179928 is a wasteful number, since it uses less digits than its factorization.

61520179928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7690022497 (or 7690022493 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 61520179928 in words is "sixty-one billion, five hundred twenty million, one hundred seventy-nine thousand, nine hundred twenty-eight".