649155211660 has 24 divisors (see below), whose sum is σ = 1363282179840. Its totient is φ = 259651373184.

The previous prime is 649155211637. The next prime is 649155211667. The reversal of 649155211660 is 66112551946.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 649155211660.

It is not an unprimeable number, because it can be changed into a prime (649155211667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163180 + ... + 1151059.

It is an arithmetic number, because the mean of its divisors is an integer number (56803424160).

Almost surely, 2^649155211660 is an apocalyptic number.

It is an amenable number.

649155211660 is an abundant number, since it is smaller than the sum of its proper divisors (714126968180).

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

649155211660 is a wasteful number, since it uses less digits than its factorization.

649155211660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338945 (or 1338943 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 649155211660 in words is "six hundred forty-nine billion, one hundred fifty-five million, two hundred eleven thousand, six hundred sixty".