3766501721 has 2 divisors, whose sum is σ = 3766501722. Its totient is φ = 3766501720.

The previous prime is 3766501699. The next prime is 3766501751. The reversal of 3766501721 is 1271056673.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3060855625 + 705646096 = 55325^2 + 26564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3766501721 is a prime.

It is not a weakly prime, because it can be changed into another prime (3766501751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1883250860 + 1883250861.

It is an arithmetic number, because the mean of its divisors is an integer number (1883250861).

Almost surely, 2^3766501721 is an apocalyptic number.

It is an amenable number.

3766501721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3766501721 is an equidigital number, since it uses as much as digits as its factorization.

3766501721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 3766501721 is about 61371.8316575284. The cubic root of 3766501721 is about 1555.8917932663.

The spelling of 3766501721 in words is "three billion, seven hundred sixty-six million, five hundred one thousand, seven hundred twenty-one".