61545510201523 has 4 divisors (see below), whose sum is σ = 61578369525448. Its totient is φ = 61512650877600.

The previous prime is 61545510201509. The next prime is 61545510201559. The reversal of 61545510201523 is 32510201554516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61545510201523 - 2⁹ = 61545510201011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61545510207523) 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, 16429659153 + ... + 16429662898.

It is an arithmetic number, because the mean of its divisors is an integer number (15394592381362).

Almost surely, 2^{61545510201523} is an apocalyptic number.

61545510201523 is a deficient number, since it is larger than the sum of its proper divisors (32859323925).

61545510201523 is a wasteful number, since it uses less digits than its factorization.

61545510201523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32859323924.

The product of its (nonzero) digits is 180000, while the sum is 40.

The spelling of 61545510201523 in words is "sixty-one trillion, five hundred forty-five billion, five hundred ten million, two hundred one thousand, five hundred twenty-three".