75551101621 has 2 divisors, whose sum is σ = 75551101622. Its totient is φ = 75551101620.

The previous prime is 75551101603. The next prime is 75551101651. The reversal of 75551101621 is 12610115557.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66468058596 + 9083043025 = 257814^2 + 95305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75551101621 is a prime.

It is a super-2 number, since 2×75551101621² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75551101651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37775550810 + 37775550811.

It is an arithmetic number, because the mean of its divisors is an integer number (37775550811).

Almost surely, 2^75551101621 is an apocalyptic number.

It is an amenable number.

75551101621 is a deficient number, since it is larger than the sum of its proper divisors (1).

75551101621 is an equidigital number, since it uses as much as digits as its factorization.

75551101621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10500, while the sum is 34.

The spelling of 75551101621 in words is "seventy-five billion, five hundred fifty-one million, one hundred one thousand, six hundred twenty-one".