78347974454 has 4 divisors (see below), whose sum is σ = 117521961684. Its totient is φ = 39173987226.

The previous prime is 78347974361. The next prime is 78347974493. The reversal of 78347974454 is 45447974387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45447974387 = 16319 ⋅2784973.

It is a super-2 number, since 2×78347974454² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19586993612 + ... + 19586993615.

It is an arithmetic number, because the mean of its divisors is an integer number (29380490421).

Almost surely, 2^78347974454 is an apocalyptic number.

78347974454 is a deficient number, since it is larger than the sum of its proper divisors (39173987230).

78347974454 is a wasteful number, since it uses less digits than its factorization.

78347974454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39173987229.

The product of its digits is 94832640, while the sum is 62.

The spelling of 78347974454 in words is "seventy-eight billion, three hundred forty-seven million, nine hundred seventy-four thousand, four hundred fifty-four".