1397557768770 has 48 divisors (see below), whose sum is σ = 3750864728832. Its totient is φ = 360660068640.

The previous prime is 1397557768729. The next prime is 1397557768787. The reversal of 1397557768770 is 778677557931.

1397557768770 is a `hidden beast` number, since 1 + 3 + 9 + 7 + 557 + 7 + 68 + 7 + 7 + 0 = 666.

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 23 ways as a sum of consecutive naturals, for example, 250455592 + ... + 250461171.

It is an arithmetic number, because the mean of its divisors is an integer number (78143015184).

Almost surely, 2^{1397557768770} is an apocalyptic number.

1397557768770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1397557768770 is an abundant number, since it is smaller than the sum of its proper divisors (2353306960062).

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

1397557768770 is a wasteful number, since it uses less digits than its factorization.

1397557768770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500916807 (or 500916804 counting only the distinct ones).

The product of its (nonzero) digits is 544546800, while the sum is 72.

The spelling of 1397557768770 in words is "one trillion, three hundred ninety-seven billion, five hundred fifty-seven million, seven hundred sixty-eight thousand, seven hundred seventy".