611115620861261 has 4 divisors (see below), whose sum is σ = 611591938571712. Its totient is φ = 610639303150812.

The previous prime is 611115620861237. The next prime is 611115620861341. The reversal of 611115620861261 is 162168026511116.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 611115620861261 - 2²² = 611115616666957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611115620861201) 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, 238158853301 + ... + 238158855866.

It is an arithmetic number, because the mean of its divisors is an integer number (152897984642928).

Almost surely, 2^{611115620861261} is an apocalyptic number.

It is an amenable number.

611115620861261 is a deficient number, since it is larger than the sum of its proper divisors (476317710451).

611115620861261 is a wasteful number, since it uses less digits than its factorization.

611115620861261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476317710450.

The product of its (nonzero) digits is 207360, while the sum is 47.

The spelling of 611115620861261 in words is "six hundred eleven trillion, one hundred fifteen billion, six hundred twenty million, eight hundred sixty-one thousand, two hundred sixty-one".