1640361546756 has 27 divisors (see below), whose sum is σ = 4146488890453. Its totient is φ = 546784620720.

The previous prime is 1640361546749. The next prime is 1640361546763. The reversal of 1640361546756 is 6576451630461.

The square root of 1640361546756 is 1280766.

It is a perfect power (a square), and thus also a powerful number.

1640361546756 is a `hidden beast` number, since 1 + 6 + 40 + 3 + 6 + 1 + 546 + 7 + 56 = 666.

It is an interprime number because it is at equal distance from previous prime (1640361546749) and next prime (1640361546763).

It can be written as a sum of positive squares in only one way, i.e., 879907785156 + 760453761600 = 938034^2 + 872040^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7577866 + ... + 7791326.

Almost surely, 2^{1640361546756} is an apocalyptic number.

1640361546756 is the 1280766-th square number.

It is an amenable number.

1640361546756 is an abundant number, since it is smaller than the sum of its proper divisors (2506127343697).

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

1640361546756 is an frugal number, since it uses more digits than its factorization.

1640361546756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426932 (or 213466 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 54.

The spelling of 1640361546756 in words is "one trillion, six hundred forty billion, three hundred sixty-one million, five hundred forty-six thousand, seven hundred fifty-six".