45611901821 has 2 divisors, whose sum is σ = 45611901822. Its totient is φ = 45611901820.

The previous prime is 45611901793. The next prime is 45611901877. The reversal of 45611901821 is 12810911654.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37379968921 + 8231932900 = 193339^2 + 90730^2 .

It is a cyclic number.

It is not a de Polignac number, because 45611901821 - 2³⁴ = 28432032637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45611909821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22805950910 + 22805950911.

It is an arithmetic number, because the mean of its divisors is an integer number (22805950911).

Almost surely, 2^45611901821 is an apocalyptic number.

It is an amenable number.

45611901821 is a deficient number, since it is larger than the sum of its proper divisors (1).

45611901821 is an equidigital number, since it uses as much as digits as its factorization.

45611901821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 38.

The spelling of 45611901821 in words is "forty-five billion, six hundred eleven million, nine hundred one thousand, eight hundred twenty-one".