61887471811 has 16 divisors (see below), whose sum is σ = 67862497248. Its totient is φ = 55971020800.

The previous prime is 61887471799. The next prime is 61887471847. The reversal of 61887471811 is 11817478816.

61887471811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 61887471811 - 2¹³ = 61887463619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61887471871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3109251 + ... + 3129091.

It is an arithmetic number, because the mean of its divisors is an integer number (4241406078).

Almost surely, 2^61887471811 is an apocalyptic number.

61887471811 is a deficient number, since it is larger than the sum of its proper divisors (5975025437).

61887471811 is a wasteful number, since it uses less digits than its factorization.

61887471811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21302.

The product of its digits is 602112, while the sum is 52.

The spelling of 61887471811 in words is "sixty-one billion, eight hundred eighty-seven million, four hundred seventy-one thousand, eight hundred eleven".