78549491253 has 16 divisors (see below), whose sum is σ = 111014133120. Its totient is φ = 49232295936.

The previous prime is 78549491249. The next prime is 78549491261. The reversal of 78549491253 is 35219494587.

It is not a de Polignac number, because 78549491253 - 2² = 78549491249 is a prime.

It is a super-2 number, since 2×78549491253² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78549491193 and 78549491202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78549491213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 791100 + ... + 884837.

It is an arithmetic number, because the mean of its divisors is an integer number (6938383320).

Almost surely, 2^78549491253 is an apocalyptic number.

It is an amenable number.

78549491253 is a deficient number, since it is larger than the sum of its proper divisors (32464641867).

78549491253 is a wasteful number, since it uses less digits than its factorization.

78549491253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676876.

The product of its digits is 10886400, while the sum is 57.

The spelling of 78549491253 in words is "seventy-eight billion, five hundred forty-nine million, four hundred ninety-one thousand, two hundred fifty-three".