545415215523 has 4 divisors (see below), whose sum is σ = 727220287368. Its totient is φ = 363610143680.

The previous prime is 545415215503. The next prime is 545415215537. The reversal of 545415215523 is 325512514545.

It is a happy number.

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 545415215523 - 2¹⁸ = 545414953379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (545415215503) 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, 90902535918 + ... + 90902535923.

It is an arithmetic number, because the mean of its divisors is an integer number (181805071842).

Almost surely, 2^545415215523 is an apocalyptic number.

545415215523 is a deficient number, since it is larger than the sum of its proper divisors (181805071845).

545415215523 is a wasteful number, since it uses less digits than its factorization.

545415215523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181805071844.

The product of its digits is 600000, while the sum is 42.

The spelling of 545415215523 in words is "five hundred forty-five billion, four hundred fifteen million, two hundred fifteen thousand, five hundred twenty-three".