649451171963 has 4 divisors (see below), whose sum is σ = 708492187608. Its totient is φ = 590410156320.

The previous prime is 649451171939. The next prime is 649451171977. The reversal of 649451171963 is 369171154946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 649451171963 - 2⁶ = 649451171899 is a prime.

It is a super-2 number, since 2×649451171963² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649451171899 and 649451171908.

It is not an unprimeable number, because it can be changed into a prime (649451171563) 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, 29520507806 + ... + 29520507827.

It is an arithmetic number, because the mean of its divisors is an integer number (177123046902).

Almost surely, 2^649451171963 is an apocalyptic number.

649451171963 is a deficient number, since it is larger than the sum of its proper divisors (59041015645).

649451171963 is a wasteful number, since it uses less digits than its factorization.

649451171963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59041015644.

The product of its digits is 4898880, while the sum is 56.

The spelling of 649451171963 in words is "six hundred forty-nine billion, four hundred fifty-one million, one hundred seventy-one thousand, nine hundred sixty-three".