61520179927 has 4 divisors (see below), whose sum is σ = 61569914536. Its totient is φ = 61470445320.

The previous prime is 61520179907. The next prime is 61520179999. The reversal of 61520179927 is 72997102516.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61520179927 - 2¹⁵ = 61520147159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61520179907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24865449 + ... + 24867922.

It is an arithmetic number, because the mean of its divisors is an integer number (15392478634).

Almost surely, 2^61520179927 is an apocalyptic number.

61520179927 is a deficient number, since it is larger than the sum of its proper divisors (49734609).

61520179927 is a wasteful number, since it uses less digits than its factorization.

61520179927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49734608.

The product of its (nonzero) digits is 476280, while the sum is 49.

The spelling of 61520179927 in words is "sixty-one billion, five hundred twenty million, one hundred seventy-nine thousand, nine hundred twenty-seven".