1640571488451 has 48 divisors (see below), whose sum is σ = 2873540966400. Its totient is φ = 880481873664.

The previous prime is 1640571488449. The next prime is 1640571488453. The reversal of 1640571488451 is 1548841750461.

1640571488451 is a `hidden beast` number, since 1 + 6 + 40 + 5 + 7 + 148 + 8 + 451 = 666.

It is an interprime number because it is at equal distance from previous prime (1640571488449) and next prime (1640571488453).

It is not a de Polignac number, because 1640571488451 - 2¹ = 1640571488449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640571488453) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1085961 + ... + 2111978.

It is an arithmetic number, because the mean of its divisors is an integer number (59865436800).

Almost surely, 2^{1640571488451} is an apocalyptic number.

1640571488451 is a deficient number, since it is larger than the sum of its proper divisors (1232969477949).

1640571488451 is a wasteful number, since it uses less digits than its factorization.

1640571488451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3198448 (or 3198445 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 54.

The spelling of 1640571488451 in words is "one trillion, six hundred forty billion, five hundred seventy-one million, four hundred eighty-eight thousand, four hundred fifty-one".