642156102030 has 64 divisors (see below), whose sum is σ = 1543782639168. Its totient is φ = 170952099840.

The previous prime is 642156102023. The next prime is 642156102079. The reversal of 642156102030 is 30201651246.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49615360 + ... + 49628300.

It is an arithmetic number, because the mean of its divisors is an integer number (24121603737).

Almost surely, 2^642156102030 is an apocalyptic number.

642156102030 is an abundant number, since it is smaller than the sum of its proper divisors (901626537138).

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

642156102030 is a wasteful number, since it uses less digits than its factorization.

642156102030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15621.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 642156102030 its reverse (30201651246), we get a palindrome (672357753276).

The spelling of 642156102030 in words is "six hundred forty-two billion, one hundred fifty-six million, one hundred two thousand, thirty".