1680621694395 has 64 divisors (see below), whose sum is σ = 3201374330880. Its totient is φ = 736679577600.

The previous prime is 1680621694369. The next prime is 1680621694421. The reversal of 1680621694395 is 5934961260861.

It is an interprime number because it is at equal distance from previous prime (1680621694369) and next prime (1680621694421).

It is not a de Polignac number, because 1680621694395 - 2⁵ = 1680621694363 is a prime.

It is a super-2 number, since 2×1680621694395² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2013646 + ... + 2723235.

It is an arithmetic number, because the mean of its divisors is an integer number (50021473920).

Almost surely, 2^{1680621694395} is an apocalyptic number.

1680621694395 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1680621694395 is a deficient number, since it is larger than the sum of its proper divisors (1520752636485).

1680621694395 is a wasteful number, since it uses less digits than its factorization.

1680621694395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4737036.

The product of its (nonzero) digits is 16796160, while the sum is 60.

The spelling of 1680621694395 in words is "one trillion, six hundred eighty billion, six hundred twenty-one million, six hundred ninety-four thousand, three hundred ninety-five".