61557709469 has 2 divisors, whose sum is σ = 61557709470. Its totient is φ = 61557709468.

The previous prime is 61557709429. The next prime is 61557709541. The reversal of 61557709469 is 96490775516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57278848900 + 4278860569 = 239330^2 + 65413^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61557709469 is a prime.

It is a super-2 number, since 2×61557709469² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61557709429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30778854734 + 30778854735.

It is an arithmetic number, because the mean of its divisors is an integer number (30778854735).

Almost surely, 2^61557709469 is an apocalyptic number.

It is an amenable number.

61557709469 is a deficient number, since it is larger than the sum of its proper divisors (1).

61557709469 is an equidigital number, since it uses as much as digits as its factorization.

61557709469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14288400, while the sum is 59.

The spelling of 61557709469 in words is "sixty-one billion, five hundred fifty-seven million, seven hundred nine thousand, four hundred sixty-nine".