1997161117151 has 8 divisors (see below), whose sum is σ = 2002836326400. Its totient is φ = 1991486531320.

The previous prime is 1997161117139. The next prime is 1997161117157. The reversal of 1997161117151 is 1517111617991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1997161117151 - 2¹⁸ = 1997160855007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1997161117151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997161117157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6685970 + ... + 6978288.

It is an arithmetic number, because the mean of its divisors is an integer number (250354540800).

Almost surely, 2^{1997161117151} is an apocalyptic number.

1997161117151 is a deficient number, since it is larger than the sum of its proper divisors (5675209249).

1997161117151 is a wasteful number, since it uses less digits than its factorization.

1997161117151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311709.

The product of its digits is 119070, while the sum is 50.

The spelling of 1997161117151 in words is "one trillion, nine hundred ninety-seven billion, one hundred sixty-one million, one hundred seventeen thousand, one hundred fifty-one".