649700159655456 has 720 divisors, whose sum is σ = 2519670612634560. Its totient is φ = 162331090467840.

The previous prime is 649700159655433. The next prime is 649700159655509. The reversal of 649700159655456 is 654556951007946.

649700159655456 is a `hidden beast` number, since 6 + 4 + 9 + 7 + 0 + 0 + 15 + 9 + 6 + 554 + 56 = 666.

It is a super-2 number, since 2×649700159655456² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 21015861 + ... + 41726091.

It is an arithmetic number, because the mean of its divisors is an integer number (3499542517548).

Almost surely, 2^{649700159655456} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649700159655456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1259835306317280).

649700159655456 is an abundant number, since it is smaller than the sum of its proper divisors (1869970452979104).

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

649700159655456 is a wasteful number, since it uses less digits than its factorization.

649700159655456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20710299 (or 20710275 counting only the distinct ones).

The product of its (nonzero) digits is 1224720000, while the sum is 72.

The spelling of 649700159655456 in words is "six hundred forty-nine trillion, seven hundred billion, one hundred fifty-nine million, six hundred fifty-five thousand, four hundred fifty-six".