78351665534 has 16 divisors (see below), whose sum is σ = 127804149648. Its totient is φ = 35874847872.

The previous prime is 78351665503. The next prime is 78351665537. The reversal of 78351665534 is 43556615387.

It is a super-2 number, since 2×78351665534² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78351665537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31140104 + ... + 31142619.

It is an arithmetic number, because the mean of its divisors is an integer number (7987759353).

Almost surely, 2^78351665534 is an apocalyptic number.

78351665534 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

78351665534 is a deficient number, since it is larger than the sum of its proper divisors (49452484114).

78351665534 is a wasteful number, since it uses less digits than its factorization.

78351665534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62282779.

The product of its digits is 9072000, while the sum is 53.

The spelling of 78351665534 in words is "seventy-eight billion, three hundred fifty-one million, six hundred sixty-five thousand, five hundred thirty-four".