61520179907 has 2 divisors, whose sum is σ = 61520179908. Its totient is φ = 61520179906.

The previous prime is 61520179891. The next prime is 61520179999. The reversal of 61520179907 is 70997102516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61520179907 - 2⁴ = 61520179891 is a prime.

It is not a weakly prime, because it can be changed into another prime (61520179607) by changing a digit.

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, 30760089953 + 30760089954.

It is an arithmetic number, because the mean of its divisors is an integer number (30760089954).

Almost surely, 2^61520179907 is an apocalyptic number.

61520179907 is a deficient number, since it is larger than the sum of its proper divisors (1).

61520179907 is an equidigital number, since it uses as much as digits as its factorization.

61520179907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 238140, while the sum is 47.

The spelling of 61520179907 in words is "sixty-one billion, five hundred twenty million, one hundred seventy-nine thousand, nine hundred seven".