612220651640 has 64 divisors (see below), whose sum is σ = 1561534480800. Its totient is φ = 214153293312.

The previous prime is 612220651613. The next prime is 612220651643. The reversal of 612220651640 is 46156022216.

It is a self number, because there is not a number n which added to its sum of digits gives 612220651640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612220651643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30972947 + ... + 30992706.

Almost surely, 2^612220651640 is an apocalyptic number.

It is an amenable number.

612220651640 is an abundant number, since it is smaller than the sum of its proper divisors (949313829160).

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

612220651640 is a wasteful number, since it uses less digits than its factorization.

612220651640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61965696 (or 61965692 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

Adding to 612220651640 its reverse (46156022216), we get a palindrome (658376673856).

The spelling of 612220651640 in words is "six hundred twelve billion, two hundred twenty million, six hundred fifty-one thousand, six hundred forty".