136421660680 has 96 divisors (see below), whose sum is σ = 315467314200. Its totient is φ = 53093741568.

The previous prime is 136421660677. The next prime is 136421660689. The reversal of 136421660680 is 86066124631.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30688733124 + 105732927556 = 175182^2 + 325166^2 .

It is a super-2 number, since 2×136421660680² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (136421660689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19891812 + ... + 19898668.

Almost surely, 2^136421660680 is an apocalyptic number.

136421660680 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 136421660680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157733657100).

136421660680 is an abundant number, since it is smaller than the sum of its proper divisors (179045653520).

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

136421660680 is a wasteful number, since it uses less digits than its factorization.

136421660680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7223 (or 7176 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 136421660680 in words is "one hundred thirty-six billion, four hundred twenty-one million, six hundred sixty thousand, six hundred eighty".