649549978534 has 8 divisors (see below), whose sum is σ = 1005754805568. Its totient is φ = 314298376680.

The previous prime is 649549978531. The next prime is 649549978541. The reversal of 649549978534 is 435879945946.

649549978534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×649549978534² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649549978531) 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, 5238306217 + ... + 5238306340.

It is an arithmetic number, because the mean of its divisors is an integer number (125719350696).

Almost surely, 2^649549978534 is an apocalyptic number.

649549978534 is a deficient number, since it is larger than the sum of its proper divisors (356204827034).

649549978534 is a wasteful number, since it uses less digits than its factorization.

649549978534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10476612590.

The product of its digits is 1175731200, while the sum is 73.

The spelling of 649549978534 in words is "six hundred forty-nine billion, five hundred forty-nine million, nine hundred seventy-eight thousand, five hundred thirty-four".