649907148557 has 4 divisors (see below), whose sum is σ = 650170591296. Its totient is φ = 649643705820.

The previous prime is 649907148551. The next prime is 649907148563. The reversal of 649907148557 is 755841709946.

649907148557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (649907148551) and next prime (649907148563).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649907148557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649907148493 and 649907148502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649907148551) 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, 131717669 + ... + 131722602.

It is an arithmetic number, because the mean of its divisors is an integer number (162542647824).

Almost surely, 2^649907148557 is an apocalyptic number.

It is an amenable number.

649907148557 is a deficient number, since it is larger than the sum of its proper divisors (263442739).

649907148557 is a wasteful number, since it uses less digits than its factorization.

649907148557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263442738.

The product of its (nonzero) digits is 76204800, while the sum is 65.

The spelling of 649907148557 in words is "six hundred forty-nine billion, nine hundred seven million, one hundred forty-eight thousand, five hundred fifty-seven".