1645606830978 has 48 divisors (see below), whose sum is σ = 4058729902656. Its totient is φ = 476987485920.

The previous prime is 1645606830953. The next prime is 1645606830983. The reversal of 1645606830978 is 8790386065461.

1645606830978 is a `hidden beast` number, since 1 + 6 + 4 + 560 + 68 + 3 + 0 + 9 + 7 + 8 = 666.

It is a super-2 number, since 2×1645606830978² (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 23 ways as a sum of consecutive naturals, for example, 180672525 + ... + 180681632.

It is an arithmetic number, because the mean of its divisors is an integer number (84556872972).

Almost surely, 2^{1645606830978} is an apocalyptic number.

1645606830978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1645606830978 is an abundant number, since it is smaller than the sum of its proper divisors (2413123071678).

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

1645606830978 is a wasteful number, since it uses less digits than its factorization.

1645606830978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361354199 (or 361354196 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 1645606830978 in words is "one trillion, six hundred forty-five billion, six hundred six million, eight hundred thirty thousand, nine hundred seventy-eight".