61457493553 has 4 divisors (see below), whose sum is σ = 61458017380. Its totient is φ = 61456969728.

The previous prime is 61457493523. The next prime is 61457493623. The reversal of 61457493553 is 35539475416.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 53050987584 + 8406505969 = 230328^2 + 91687^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61457493553 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 61457493553.

It is not an unprimeable number, because it can be changed into a prime (61457493523) 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, 4201 + ... + 350617.

It is an arithmetic number, because the mean of its divisors is an integer number (15364504345).

Almost surely, 2^61457493553 is an apocalyptic number.

It is an amenable number.

61457493553 is a deficient number, since it is larger than the sum of its proper divisors (523827).

61457493553 is a wasteful number, since it uses less digits than its factorization.

61457493553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523826.

The product of its digits is 6804000, while the sum is 52.

The spelling of 61457493553 in words is "sixty-one billion, four hundred fifty-seven million, four hundred ninety-three thousand, five hundred fifty-three".