61535521453 has 4 divisors (see below), whose sum is σ = 70326310240. Its totient is φ = 52744732668.

The previous prime is 61535521433. The next prime is 61535521499. The reversal of 61535521453 is 35412553516.

It is a happy number.

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-61535521453 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 (61535521433) 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, 4395394383 + ... + 4395394396.

It is an arithmetic number, because the mean of its divisors is an integer number (17581577560).

Almost surely, 2^61535521453 is an apocalyptic number.

It is an amenable number.

61535521453 is a deficient number, since it is larger than the sum of its proper divisors (8790788787).

61535521453 is an equidigital number, since it uses as much as digits as its factorization.

61535521453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8790788786.

The product of its digits is 270000, while the sum is 40.

The spelling of 61535521453 in words is "sixty-one billion, five hundred thirty-five million, five hundred twenty-one thousand, four hundred fifty-three".