201512165720 has 16 divisors (see below), whose sum is σ = 453402372960. Its totient is φ = 80604866272.

The previous prime is 201512165677. The next prime is 201512165749. The reversal of 201512165720 is 27561215102.

It is a super-3 number, since 3×201512165720³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2518902032 + ... + 2518902111.

It is an arithmetic number, because the mean of its divisors is an integer number (28337648310).

Almost surely, 2^201512165720 is an apocalyptic number.

201512165720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201512165720 is an abundant number, since it is smaller than the sum of its proper divisors (251890207240).

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

201512165720 is a wasteful number, since it uses less digits than its factorization.

201512165720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5037804154 (or 5037804150 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 32.

The spelling of 201512165720 in words is "two hundred one billion, five hundred twelve million, one hundred sixty-five thousand, seven hundred twenty".