786621021642 has 24 divisors (see below), whose sum is σ = 1704429288900. Its totient is φ = 262194123840.

The previous prime is 786621021629. The next prime is 786621021691. The reversal of 786621021642 is 246120126687.

786621021642 is a `hidden beast` number, since 7 + 8 + 6 + 621 + 0 + 2 + 16 + 4 + 2 = 666.

786621021642 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 773237076921 + 13383944721 = 879339^2 + 115689^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 693459 + ... + 1433222.

Almost surely, 2^786621021642 is an apocalyptic number.

786621021642 is an abundant number, since it is smaller than the sum of its proper divisors (917808267258).

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

786621021642 is a wasteful number, since it uses less digits than its factorization.

786621021642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147238 (or 2147235 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 786621021642 in words is "seven hundred eighty-six billion, six hundred twenty-one million, twenty-one thousand, six hundred forty-two".