642646306156 has 12 divisors (see below), whose sum is σ = 1124637414768. Its totient is φ = 321321330512.

The previous prime is 642646306129. The next prime is 642646306213. The reversal of 642646306156 is 651603646246.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 619710 + ... + 1292026.

It is an arithmetic number, because the mean of its divisors is an integer number (93719784564).

Almost surely, 2^642646306156 is an apocalyptic number.

It is an amenable number.

642646306156 is a deficient number, since it is larger than the sum of its proper divisors (481991108612).

642646306156 is a wasteful number, since it uses less digits than its factorization.

642646306156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911288 (or 911286 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 49.

The spelling of 642646306156 in words is "six hundred forty-two billion, six hundred forty-six million, three hundred six thousand, one hundred fifty-six".