61438193532 has 36 divisors (see below), whose sum is σ = 155336654200. Its totient is φ = 20474841312.

The previous prime is 61438193507. The next prime is 61438193539. The reversal of 61438193532 is 23539183416.

61438193532 is a `hidden beast` number, since 61 + 43 + 8 + 19 + 3 + 532 = 666.

61438193532 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×61438193532³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61438193539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23818 + ... + 351345.

Almost surely, 2^61438193532 is an apocalyptic number.

It is an amenable number.

61438193532 is an abundant number, since it is smaller than the sum of its proper divisors (93898460668).

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

61438193532 is a wasteful number, since it uses less digits than its factorization.

61438193532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379722 (or 379717 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The spelling of 61438193532 in words is "sixty-one billion, four hundred thirty-eight million, one hundred ninety-three thousand, five hundred thirty-two".