61700172907 has 2 divisors, whose sum is σ = 61700172908. Its totient is φ = 61700172906.

The previous prime is 61700172887. The next prime is 61700172931. The reversal of 61700172907 is 70927100716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61700172907 - 2²³ = 61691784299 is a prime.

It is a super-2 number, since 2×61700172907² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61700172907.

It is not a weakly prime, because it can be changed into another prime (61700172607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30850086453 + 30850086454.

It is an arithmetic number, because the mean of its divisors is an integer number (30850086454).

Almost surely, 2^61700172907 is an apocalyptic number.

61700172907 is a deficient number, since it is larger than the sum of its proper divisors (1).

61700172907 is an equidigital number, since it uses as much as digits as its factorization.

61700172907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37044, while the sum is 40.

The spelling of 61700172907 in words is "sixty-one billion, seven hundred million, one hundred seventy-two thousand, nine hundred seven".