61452187861 has 2 divisors, whose sum is σ = 61452187862. Its totient is φ = 61452187860.

The previous prime is 61452187837. The next prime is 61452187897. The reversal of 61452187861 is 16878125416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61055939025 + 396248836 = 247095^2 + 19906^2 .

It is a cyclic number.

It is not a de Polignac number, because 61452187861 - 2⁵ = 61452187829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61452187361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30726093930 + 30726093931.

It is an arithmetic number, because the mean of its divisors is an integer number (30726093931).

Almost surely, 2^61452187861 is an apocalyptic number.

It is an amenable number.

61452187861 is a deficient number, since it is larger than the sum of its proper divisors (1).

61452187861 is an equidigital number, since it uses as much as digits as its factorization.

61452187861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 49.

The spelling of 61452187861 in words is "sixty-one billion, four hundred fifty-two million, one hundred eighty-seven thousand, eight hundred sixty-one".