61164361553 has 4 divisors (see below), whose sum is σ = 61228950000. Its totient is φ = 61099773108.

The previous prime is 61164361543. The next prime is 61164361571. The reversal of 61164361553 is 35516346116.

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 a de Polignac number, because none of the positive numbers 2^k-61164361553 is a prime.

It is a super-2 number, since 2×61164361553² (a number of 22 digits) contains 22 as substring.

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 61164361553.

It is not an unprimeable number, because it can be changed into a prime (61164361543) 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, 32292803 + ... + 32294696.

It is an arithmetic number, because the mean of its divisors is an integer number (15307237500).

Almost surely, 2^61164361553 is an apocalyptic number.

It is an amenable number.

61164361553 is a deficient number, since it is larger than the sum of its proper divisors (64588447).

61164361553 is an equidigital number, since it uses as much as digits as its factorization.

61164361553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64588446.

The product of its digits is 194400, while the sum is 41.

The spelling of 61164361553 in words is "sixty-one billion, one hundred sixty-four million, three hundred sixty-one thousand, five hundred fifty-three".