137720181663 has 16 divisors (see below), whose sum is σ = 206824831840. Its totient is φ = 90555734592.

The previous prime is 137720181659. The next prime is 137720181667. The reversal of 137720181663 is 366181027731.

137720181663 is a `hidden beast` number, since 1 + 377 + 201 + 8 + 16 + 63 = 666.

It is an interprime number because it is at equal distance from previous prime (137720181659) and next prime (137720181667).

It is not a de Polignac number, because 137720181663 - 2² = 137720181659 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 (137720181667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34934656 + ... + 34938597.

It is an arithmetic number, because the mean of its divisors is an integer number (12926551990).

Almost surely, 2^137720181663 is an apocalyptic number.

137720181663 is a deficient number, since it is larger than the sum of its proper divisors (69104650177).

137720181663 is an equidigital number, since it uses as much as digits as its factorization.

137720181663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69873335 (or 69873329 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 137720181663 in words is "one hundred thirty-seven billion, seven hundred twenty million, one hundred eighty-one thousand, six hundred sixty-three".