1640401573740 has 96 divisors (see below), whose sum is σ = 4911460069824. Its totient is φ = 407632281600.

The previous prime is 1640401573711. The next prime is 1640401573763. The reversal of 1640401573740 is 473751040461.

It is a junction number, because it is equal to n+sod(n) for n = 1640401573692 and 1640401573701.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7858549 + ... + 8064588.

It is an arithmetic number, because the mean of its divisors is an integer number (51161042394).

Almost surely, 2^{1640401573740} is an apocalyptic number.

1640401573740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640401573740 is an abundant number, since it is smaller than the sum of its proper divisors (3271058496084).

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

1640401573740 is a wasteful number, since it uses less digits than its factorization.

1640401573740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15923267 (or 15923265 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

The spelling of 1640401573740 in words is "one trillion, six hundred forty billion, four hundred one million, five hundred seventy-three thousand, seven hundred forty".