661273484495 has 48 divisors (see below), whose sum is σ = 943814799360. Its totient is φ = 442509395328.

The previous prime is 661273484477. The next prime is 661273484503. The reversal of 661273484495 is 594484372166.

It is not a de Polignac number, because 661273484495 - 2¹⁴ = 661273468111 is a prime.

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 526127 + ... + 1264656.

It is an arithmetic number, because the mean of its divisors is an integer number (19662808320).

Almost surely, 2^661273484495 is an apocalyptic number.

661273484495 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

661273484495 is a deficient number, since it is larger than the sum of its proper divisors (282541314865).

661273484495 is a wasteful number, since it uses less digits than its factorization.

661273484495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790856 (or 1790843 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 59.

The spelling of 661273484495 in words is "six hundred sixty-one billion, two hundred seventy-three million, four hundred eighty-four thousand, four hundred ninety-five".