61537465813 has 4 divisors (see below), whose sum is σ = 62455935520. Its totient is φ = 60618996108.

The previous prime is 61537465811. The next prime is 61537465823. The reversal of 61537465813 is 31856473516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61537465813 - 2¹ = 61537465811 is a prime.

It is a super-2 number, since 2×61537465813² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61537465811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459234753 + ... + 459234886.

It is an arithmetic number, because the mean of its divisors is an integer number (15613983880).

Almost surely, 2^61537465813 is an apocalyptic number.

It is an amenable number.

61537465813 is a deficient number, since it is larger than the sum of its proper divisors (918469707).

61537465813 is an equidigital number, since it uses as much as digits as its factorization.

61537465813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918469706.

The product of its digits is 1814400, while the sum is 49.

The spelling of 61537465813 in words is "sixty-one billion, five hundred thirty-seven million, four hundred sixty-five thousand, eight hundred thirteen".