61523429977 has 2 divisors, whose sum is σ = 61523429978. Its totient is φ = 61523429976.

The previous prime is 61523429969. The next prime is 61523430011. The reversal of 61523429977 is 77992432516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31030936336 + 30492493641 = 176156^2 + 174621^2 .

It is a cyclic number.

It is not a de Polignac number, because 61523429977 - 2³ = 61523429969 is a prime.

It is a super-2 number, since 2×61523429977² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61523429677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30761714988 + 30761714989.

It is an arithmetic number, because the mean of its divisors is an integer number (30761714989).

Almost surely, 2^61523429977 is an apocalyptic number.

It is an amenable number.

61523429977 is a deficient number, since it is larger than the sum of its proper divisors (1).

61523429977 is an equidigital number, since it uses as much as digits as its factorization.

61523429977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 55.

The spelling of 61523429977 in words is "sixty-one billion, five hundred twenty-three million, four hundred twenty-nine thousand, nine hundred seventy-seven".