78213465542157 has 16 divisors (see below), whose sum is σ = 116185573573632. Its totient is φ = 46393545001520.

The previous prime is 78213465542137. The next prime is 78213465542161. The reversal of 78213465542157 is 75124556431287.

It is not a de Polignac number, because 78213465542157 - 2¹¹ = 78213465540109 is a prime.

It is a super-2 number, since 2×78213465542157² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78213465542157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78213465542137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25213881603 + ... + 25213884704.

It is an arithmetic number, because the mean of its divisors is an integer number (7261598348352).

Almost surely, 2^{78213465542157} is an apocalyptic number.

It is an amenable number.

78213465542157 is a deficient number, since it is larger than the sum of its proper divisors (37972108031475).

78213465542157 is a wasteful number, since it uses less digits than its factorization.

78213465542157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50427766368.

The product of its digits is 56448000, while the sum is 60.

The spelling of 78213465542157 in words is "seventy-eight trillion, two hundred thirteen billion, four hundred sixty-five million, five hundred forty-two thousand, one hundred fifty-seven".