1620495868785 has 32 divisors (see below), whose sum is σ = 2628488823168. Its totient is φ = 852367587840.

The previous prime is 1620495868757. The next prime is 1620495868787. The reversal of 1620495868785 is 5878685940261.

It is not a de Polignac number, because 1620495868785 - 2⁸ = 1620495868529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620495868787) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19716075 + ... + 19798095.

It is an arithmetic number, because the mean of its divisors is an integer number (82140275724).

Almost surely, 2^{1620495868785} is an apocalyptic number.

1620495868785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1620495868785 is a deficient number, since it is larger than the sum of its proper divisors (1007992954383).

1620495868785 is a wasteful number, since it uses less digits than its factorization.

1620495868785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100145.

The product of its (nonzero) digits is 232243200, while the sum is 69.

The spelling of 1620495868785 in words is "one trillion, six hundred twenty billion, four hundred ninety-five million, eight hundred sixty-eight thousand, seven hundred eighty-five".