78221733091 has 8 divisors (see below), whose sum is σ = 81697381920. Its totient is φ = 74752309632.

The previous prime is 78221733067. The next prime is 78221733101. The reversal of 78221733091 is 19033712287.

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

It is a cyclic number.

It is not a de Polignac number, because 78221733091 - 2²¹ = 78219635939 is a prime.

It is a super-2 number, since 2×78221733091² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78221763091) 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, 1530646 + ... + 1580923.

It is an arithmetic number, because the mean of its divisors is an integer number (10212172740).

Almost surely, 2^78221733091 is an apocalyptic number.

78221733091 is a deficient number, since it is larger than the sum of its proper divisors (3475648829).

78221733091 is a wasteful number, since it uses less digits than its factorization.

78221733091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112685.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 78221733091 in words is "seventy-eight billion, two hundred twenty-one million, seven hundred thirty-three thousand, ninety-one".