661350533737 has 2 divisors, whose sum is σ = 661350533738. Its totient is φ = 661350533736.

The previous prime is 661350533731. The next prime is 661350533771. The reversal of 661350533737 is 737335053166.

661350533737 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 604406734096 + 56943799641 = 777436^2 + 238629^2 .

It is a cyclic number.

It is not a de Polignac number, because 661350533737 - 2⁷ = 661350533609 is a prime.

It is a super-4 number, since 4×661350533737⁴ (a number of 48 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (661350533731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330675266868 + 330675266869.

It is an arithmetic number, because the mean of its divisors is an integer number (330675266869).

Almost surely, 2^661350533737 is an apocalyptic number.

It is an amenable number.

661350533737 is a deficient number, since it is larger than the sum of its proper divisors (1).

661350533737 is an equidigital number, since it uses as much as digits as its factorization.

661350533737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3572100, while the sum is 49.

The spelling of 661350533737 in words is "six hundred sixty-one billion, three hundred fifty million, five hundred thirty-three thousand, seven hundred thirty-seven".