201510201997 has 32 divisors (see below), whose sum is σ = 223040442240. Its totient is φ = 180928788480.

The previous prime is 201510201961. The next prime is 201510202001. The reversal of 201510201997 is 799102015102.

It is a cyclic number.

It is not a de Polignac number, because 201510201997 - 2⁷ = 201510201869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201510202997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23139118 + ... + 23147824.

It is an arithmetic number, because the mean of its divisors is an integer number (6970013820).

Almost surely, 2^201510201997 is an apocalyptic number.

It is an amenable number.

201510201997 is a deficient number, since it is larger than the sum of its proper divisors (21530240243).

201510201997 is a wasteful number, since it uses less digits than its factorization.

201510201997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9133.

The product of its (nonzero) digits is 11340, while the sum is 37.

The spelling of 201510201997 in words is "two hundred one billion, five hundred ten million, two hundred one thousand, nine hundred ninety-seven".