651294191016 has 72 divisors (see below), whose sum is σ = 2051909005770. Its totient is φ = 186084053568.

The previous prime is 651294190979. The next prime is 651294191029. The reversal of 651294191016 is 610191492156.

651294191016 is a `hidden beast` number, since 6 + 5 + 129 + 419 + 101 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 394944374916 + 256349816100 = 628446^2 + 506310^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×651294191016² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 92300071 + ... + 92307126.

Almost surely, 2^651294191016 is an apocalyptic number.

It is an amenable number.

651294191016 is an abundant number, since it is smaller than the sum of its proper divisors (1400614814754).

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

651294191016 is a wasteful number, since it uses less digits than its factorization.

651294191016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184607223 (or 184607209 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 651294191016 in words is "six hundred fifty-one billion, two hundred ninety-four million, one hundred ninety-one thousand, sixteen".