497749766981 has 4 divisors (see below), whose sum is σ = 497773993632. Its totient is φ = 497725540332.

The previous prime is 497749766971. The next prime is 497749766999. The reversal of 497749766981 is 189667947794.

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 497749766981 - 2²⁶ = 497682658117 is a prime.

It is a super-2 number, since 2×497749766981² (a number of 24 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 (497749766971) 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, 12082481 + ... + 12123606.

It is an arithmetic number, because the mean of its divisors is an integer number (124443498408).

Almost surely, 2^497749766981 is an apocalyptic number.

It is an amenable number.

497749766981 is a deficient number, since it is larger than the sum of its proper divisors (24226651).

497749766981 is a wasteful number, since it uses less digits than its factorization.

497749766981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24226650.

The product of its digits is 1152216576, while the sum is 77.

The spelling of 497749766981 in words is "four hundred ninety-seven billion, seven hundred forty-nine million, seven hundred sixty-six thousand, nine hundred eighty-one".