77180451770921 has 16 divisors (see below), whose sum is σ = 81335007042048. Its totient is φ = 73092497016000.

The previous prime is 77180451770789. The next prime is 77180451770951. The reversal of 77180451770921 is 12907715408177.

It is a cyclic number.

It is not a de Polignac number, because 77180451770921 - 2¹⁴ = 77180451754537 is a prime.

It is a super-2 number, since 2×77180451770921² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77180451770951) 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, 139840976 + ... + 140391806.

It is an arithmetic number, because the mean of its divisors is an integer number (5083437940128).

Almost surely, 2^{77180451770921} is an apocalyptic number.

It is an amenable number.

77180451770921 is a deficient number, since it is larger than the sum of its proper divisors (4154555271127).

77180451770921 is a wasteful number, since it uses less digits than its factorization.

77180451770921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611272.

The product of its (nonzero) digits is 6914880, while the sum is 59.

The spelling of 77180451770921 in words is "seventy-seven trillion, one hundred eighty billion, four hundred fifty-one million, seven hundred seventy thousand, nine hundred twenty-one".