61185037453 has 4 divisors (see below), whose sum is σ = 61231995808. Its totient is φ = 61138079100.

The previous prime is 61185037439. The next prime is 61185037493. The reversal of 61185037453 is 35473058116.

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-61185037453 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 (61185037423) 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, 23477223 + ... + 23479828.

It is an arithmetic number, because the mean of its divisors is an integer number (15307998952).

Almost surely, 2^61185037453 is an apocalyptic number.

It is an amenable number.

61185037453 is a deficient number, since it is larger than the sum of its proper divisors (46958355).

61185037453 is a wasteful number, since it uses less digits than its factorization.

61185037453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46958354.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 61185037453 in words is "sixty-one billion, one hundred eighty-five million, thirty-seven thousand, four hundred fifty-three".