2157355773840 has 40 divisors (see below), whose sum is σ = 6687802899648. Its totient is φ = 575294872960.

The previous prime is 2157355773823. The next prime is 2157355773871. The reversal of 2157355773840 is 483775537512.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4494490956 + ... + 4494491435.

Almost surely, 2^{2157355773840} is an apocalyptic number.

2157355773840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157355773840 is an abundant number, since it is smaller than the sum of its proper divisors (4530447125808).

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

2157355773840 is a wasteful number, since it uses less digits than its factorization.

2157355773840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8988982407 (or 8988982401 counting only the distinct ones).

The product of its (nonzero) digits is 24696000, while the sum is 57.

The spelling of 2157355773840 in words is "two trillion, one hundred fifty-seven billion, three hundred fifty-five million, seven hundred seventy-three thousand, eight hundred forty".