37572451621 has 4 divisors (see below), whose sum is σ = 39782595852. Its totient is φ = 35362307392.

The previous prime is 37572451559. The next prime is 37572451661. The reversal of 37572451621 is 12615427573.

It is a happy number.

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 34007048100 + 3565403521 = 184410^2 + 59711^2 .

It is a cyclic number.

It is not a de Polignac number, because 37572451621 - 2¹³ = 37572443429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37572451661) 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, 1105072090 + ... + 1105072123.

It is an arithmetic number, because the mean of its divisors is an integer number (9945648963).

Almost surely, 2^37572451621 is an apocalyptic number.

It is an amenable number.

37572451621 is a deficient number, since it is larger than the sum of its proper divisors (2210144231).

37572451621 is a wasteful number, since it uses less digits than its factorization.

37572451621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210144230.

The product of its digits is 352800, while the sum is 43.

The spelling of 37572451621 in words is "thirty-seven billion, five hundred seventy-two million, four hundred fifty-one thousand, six hundred twenty-one".