71261390542440 has 128 divisors (see below), whose sum is σ = 246566279520000. Its totient is φ = 16138883708928.

The previous prime is 71261390542393. The next prime is 71261390542457. The reversal of 71261390542440 is 4424509316217.

It is a self number, because there is not a number n which added to its sum of digits gives 71261390542440.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 389059765 + ... + 389242884.

It is an arithmetic number, because the mean of its divisors is an integer number (1926299058750).

Almost surely, 2^{71261390542440} is an apocalyptic number.

71261390542440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71261390542440 is an abundant number, since it is smaller than the sum of its proper divisors (175304888977560).

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

71261390542440 is a wasteful number, since it uses less digits than its factorization.

71261390542440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778302779 (or 778302775 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

Adding to 71261390542440 its reverse (4424509316217), we get a palindrome (75685899858657).

The spelling of 71261390542440 in words is "seventy-one trillion, two hundred sixty-one billion, three hundred ninety million, five hundred forty-two thousand, four hundred forty".