61535530431 has 12 divisors (see below), whose sum is σ = 88904496408. Its totient is φ = 41014529424.

The previous prime is 61535530393. The next prime is 61535530453. The reversal of 61535530431 is 13403553516.

61535530431 is a `hidden beast` number, since 61 + 5 + 3 + 553 + 0 + 43 + 1 = 666.

It is not a de Polignac number, because 61535530431 - 2²⁵ = 61501975999 is a prime.

It is a super-2 number, since 2×61535530431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61535530531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 720445 + ... + 801318.

It is an arithmetic number, because the mean of its divisors is an integer number (7408708034).

Almost surely, 2^61535530431 is an apocalyptic number.

61535530431 is a deficient number, since it is larger than the sum of its proper divisors (27368965977).

61535530431 is a wasteful number, since it uses less digits than its factorization.

61535530431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526262 (or 1526259 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The spelling of 61535530431 in words is "sixty-one billion, five hundred thirty-five million, five hundred thirty thousand, four hundred thirty-one".