61700172911 has 4 divisors (see below), whose sum is σ = 66446340072. Its totient is φ = 56954005752.

The previous prime is 61700172907. The next prime is 61700172931. The reversal of 61700172911 is 11927100716.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61700172911 - 2² = 61700172907 is a prime.

It is a super-2 number, since 2×61700172911² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61700172931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2373083561 + ... + 2373083586.

It is an arithmetic number, because the mean of its divisors is an integer number (16611585018).

Almost surely, 2^61700172911 is an apocalyptic number.

61700172911 is a deficient number, since it is larger than the sum of its proper divisors (4746167161).

61700172911 is a wasteful number, since it uses less digits than its factorization.

61700172911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4746167160.

The product of its (nonzero) digits is 5292, while the sum is 35.

The spelling of 61700172911 in words is "sixty-one billion, seven hundred million, one hundred seventy-two thousand, nine hundred eleven".