61475645731 has 16 divisors (see below), whose sum is σ = 62883475200. Its totient is φ = 60081955200.

The previous prime is 61475645711. The next prime is 61475645741. The reversal of 61475645731 is 13754657416.

It is a happy number.

61475645731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 61475645731 - 2⁹ = 61475645219 is a prime.

It is a super-2 number, since 2×61475645731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61475645711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6378286 + ... + 6387916.

It is an arithmetic number, because the mean of its divisors is an integer number (3930217200).

Almost surely, 2^61475645731 is an apocalyptic number.

61475645731 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

61475645731 is a deficient number, since it is larger than the sum of its proper divisors (1407829469).

61475645731 is a wasteful number, since it uses less digits than its factorization.

61475645731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10350.

The product of its digits is 2116800, while the sum is 49.

The spelling of 61475645731 in words is "sixty-one billion, four hundred seventy-five million, six hundred forty-five thousand, seven hundred thirty-one".