149161687640 has 128 divisors (see below), whose sum is σ = 411841843200. Its totient is φ = 47454812160.

The previous prime is 149161687639. The next prime is 149161687643. The reversal of 149161687640 is 46786161941.

It is a super-2 number, since 2×149161687640² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149161687643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117281 + ... + 558639.

It is an arithmetic number, because the mean of its divisors is an integer number (3217514400).

Almost surely, 2^149161687640 is an apocalyptic number.

149161687640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 149161687640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205920921600).

149161687640 is an abundant number, since it is smaller than the sum of its proper divisors (262680155560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

149161687640 is a wasteful number, since it uses less digits than its factorization.

149161687640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441465 (or 441461 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 53.

The spelling of 149161687640 in words is "one hundred forty-nine billion, one hundred sixty-one million, six hundred eighty-seven thousand, six hundred forty".