2173507148261 has 2 divisors, whose sum is σ = 2173507148262. Its totient is φ = 2173507148260.

The previous prime is 2173507148251. The next prime is 2173507148269. The reversal of 2173507148261 is 1628417053712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1583193062500 + 590314085761 = 1258250^2 + 768319^2 .

It is a cyclic number.

It is not a de Polignac number, because 2173507148261 - 2¹⁰ = 2173507147237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2173507148269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086753574130 + 1086753574131.

It is an arithmetic number, because the mean of its divisors is an integer number (1086753574131).

Almost surely, 2^{2173507148261} is an apocalyptic number.

It is an amenable number.

2173507148261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2173507148261 is an equidigital number, since it uses as much as digits as its factorization.

2173507148261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 2173507148261 in words is "two trillion, one hundred seventy-three billion, five hundred seven million, one hundred forty-eight thousand, two hundred sixty-one".