181437633130 has 16 divisors (see below), whose sum is σ = 351709873704. Its totient is φ = 66992356800.

The previous prime is 181437633127. The next prime is 181437633137. The reversal of 181437633130 is 31336734181.

It can be written as a sum of positive squares in 4 ways, for example, as 50401597009 + 131036036121 = 224503^2 + 361989^2 .

It is a super-2 number, since 2×181437633130² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181437633137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 697836921 + ... + 697837180.

Almost surely, 2^181437633130 is an apocalyptic number.

181437633130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181437633130 is a deficient number, since it is larger than the sum of its proper divisors (170272240574).

181437633130 is a wasteful number, since it uses less digits than its factorization.

181437633130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395674121.

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 181437633130 in words is "one hundred eighty-one billion, four hundred thirty-seven million, six hundred thirty-three thousand, one hundred thirty".