74821790701681 has 9 divisors (see below), whose sum is σ = 78967215718923. Its totient is φ = 70883646018120.

The previous prime is 74821790701631. The next prime is 74821790701717. The reversal of 74821790701681 is 18610709712847.

The square root of 74821790701681 is 8649959.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 54834632211681 + 19987158490000 = 7405041^2 + 4470700^2 .

It is not a de Polignac number, because 74821790701681 - 2³⁵ = 74787430963313 is a prime.

It is a super-2 number, since 2×74821790701681² (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 (74821790701631) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 164121591 + ... + 164576851.

Almost surely, 2^{74821790701681} is an apocalyptic number.

74821790701681 is the 8649959-th square number.

74821790701681 is the 4324980-th centered octagonal number.

It is an amenable number.

74821790701681 is a deficient number, since it is larger than the sum of its proper divisors (4145425017242).

74821790701681 is an frugal number, since it uses more digits than its factorization.

74821790701681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910560 (or 455280 counting only the distinct ones).

The product of its (nonzero) digits is 9483264, while the sum is 61.

The spelling of 74821790701681 in words is "seventy-four trillion, eight hundred twenty-one billion, seven hundred ninety million, seven hundred one thousand, six hundred eighty-one".