187070805701621 has 6 divisors (see below), whose sum is σ = 189468765082422. Its totient is φ = 184702820813160.

The previous prime is 187070805701603. The next prime is 187070805701651. The reversal of 187070805701621 is 126107508070781.

It can be written as a sum of positive squares in only one way, i.e., 170539962219025 + 16530843482596 = 13059095^2 + 4065814^2 .

It is not a de Polignac number, because 187070805701621 - 2¹⁴ = 187070805685237 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 (187070805701651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14987239850 + ... + 14987252331.

It is an arithmetic number, because the mean of its divisors is an integer number (31578127513737).

Almost surely, 2^{187070805701621} is an apocalyptic number.

It is an amenable number.

187070805701621 is a deficient number, since it is larger than the sum of its proper divisors (2397959380801).

187070805701621 is an frugal number, since it uses more digits than its factorization.

187070805701621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29974492339 (or 29974492260 counting only the distinct ones).

The product of its (nonzero) digits is 1317120, while the sum is 53.

The spelling of 187070805701621 in words is "one hundred eighty-seven trillion, seventy billion, eight hundred five million, seven hundred one thousand, six hundred twenty-one".