61454432557 has 24 divisors (see below), whose sum is σ = 76085365176. Its totient is φ = 49319682048.

The previous prime is 61454432539. The next prime is 61454432587. The reversal of 61454432557 is 75523445416.

It can be written as a sum of positive squares in 4 ways, for example, as 16298607556 + 45155825001 = 127666^2 + 212499^2 .

It is not a de Polignac number, because 61454432557 - 2³⁵ = 27094694189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61454432587) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30358 + ... + 351895.

It is an arithmetic number, because the mean of its divisors is an integer number (3170223549).

Almost surely, 2^61454432557 is an apocalyptic number.

It is an amenable number.

61454432557 is a deficient number, since it is larger than the sum of its proper divisors (14630932619).

61454432557 is a wasteful number, since it uses less digits than its factorization.

61454432557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382477 (or 382470 counting only the distinct ones).

The product of its digits is 2016000, while the sum is 46.

The spelling of 61454432557 in words is "sixty-one billion, four hundred fifty-four million, four hundred thirty-two thousand, five hundred fifty-seven".