61887147149 has 4 divisors (see below), whose sum is σ = 65144365440. Its totient is φ = 58629928860.

The previous prime is 61887147109. The next prime is 61887147193. The reversal of 61887147149 is 94174178816.

61887147149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61887147149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61887147094 and 61887147103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61887147109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1628609117 + ... + 1628609154.

It is an arithmetic number, because the mean of its divisors is an integer number (16286091360).

Almost surely, 2^61887147149 is an apocalyptic number.

It is an amenable number.

61887147149 is a deficient number, since it is larger than the sum of its proper divisors (3257218291).

61887147149 is a wasteful number, since it uses less digits than its factorization.

61887147149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3257218290.

The product of its digits is 2709504, while the sum is 56.

The spelling of 61887147149 in words is "sixty-one billion, eight hundred eighty-seven million, one hundred forty-seven thousand, one hundred forty-nine".