73454657981 has 4 divisors (see below), whose sum is σ = 74658832764. Its totient is φ = 72250483200.

The previous prime is 73454657971. The next prime is 73454658001. The reversal of 73454657981 is 18975645437.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1560961081 + 71893696900 = 39509^2 + 268130^2 .

It is a cyclic number.

It is not a de Polignac number, because 73454657981 - 2²² = 73450463677 is a prime.

It is a super-2 number, since 2×73454657981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 73454657981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73454657921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 602087300 + ... + 602087421.

It is an arithmetic number, because the mean of its divisors is an integer number (18664708191).

Almost surely, 2^73454657981 is an apocalyptic number.

It is an amenable number.

73454657981 is a deficient number, since it is larger than the sum of its proper divisors (1204174783).

73454657981 is a wasteful number, since it uses less digits than its factorization.

73454657981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204174782.

The product of its digits is 25401600, while the sum is 59.

The spelling of 73454657981 in words is "seventy-three billion, four hundred fifty-four million, six hundred fifty-seven thousand, nine hundred eighty-one".