651611656212 has 48 divisors (see below), whose sum is σ = 1658695776192. Its totient is φ = 197452372480.

The previous prime is 651611656153. The next prime is 651611656237. The reversal of 651611656212 is 212656116156.

It is a super-2 number, since 2×651611656212² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7758508 + ... + 7842044.

It is an arithmetic number, because the mean of its divisors is an integer number (34556162004).

Almost surely, 2^651611656212 is an apocalyptic number.

It is an amenable number.

651611656212 is an abundant number, since it is smaller than the sum of its proper divisors (1007084119980).

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

651611656212 is a wasteful number, since it uses less digits than its factorization.

651611656212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142648 (or 142646 counting only the distinct ones).

The product of its digits is 129600, while the sum is 42.

The spelling of 651611656212 in words is "six hundred fifty-one billion, six hundred eleven million, six hundred fifty-six thousand, two hundred twelve".