647547745746 has 32 divisors (see below), whose sum is σ = 1414796544000. Its totient is φ = 195953659280.

The previous prime is 647547745721. The next prime is 647547745769.

647547745746 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×647547745746² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6775446 + ... + 6870353.

It is an arithmetic number, because the mean of its divisors is an integer number (44212392000).

Almost surely, 2^647547745746 is an apocalyptic number.

647547745746 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

647547745746 is an abundant number, since it is smaller than the sum of its proper divisors (767248798254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647547745746 is a wasteful number, since it uses less digits than its factorization.

647547745746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13646534.

The product of its digits is 553190400, while the sum is 66.

The spelling of 647547745746 in words is "six hundred forty-seven billion, five hundred forty-seven million, seven hundred forty-five thousand, seven hundred forty-six".