78549132981 has 8 divisors (see below), whose sum is σ = 114253284384. Its totient is φ = 47605535120.

The previous prime is 78549132979. The next prime is 78549133009. The reversal of 78549132981 is 18923194587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78549132981 - 2¹ = 78549132979 is a prime.

It is a super-2 number, since 2×78549132981² (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 (78549132931) 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, 1190138346 + ... + 1190138411.

It is an arithmetic number, because the mean of its divisors is an integer number (14281660548).

Almost surely, 2^78549132981 is an apocalyptic number.

It is an amenable number.

78549132981 is a deficient number, since it is larger than the sum of its proper divisors (35704151403).

78549132981 is a wasteful number, since it uses less digits than its factorization.

78549132981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2380276771.

The product of its digits is 4354560, while the sum is 57.

The spelling of 78549132981 in words is "seventy-eight billion, five hundred forty-nine million, one hundred thirty-two thousand, nine hundred eighty-one".