61511232450 has 48 divisors (see below), whose sum is σ = 152565297696. Its totient is φ = 16401120000.

The previous prime is 61511232443. The next prime is 61511232463. The reversal of 61511232450 is 5423211516.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1727325 + ... + 1762575.

It is an arithmetic number, because the mean of its divisors is an integer number (3178443702).

Almost surely, 2^61511232450 is an apocalyptic number.

61511232450 is an abundant number, since it is smaller than the sum of its proper divisors (91054065246).

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

61511232450 is a wasteful number, since it uses less digits than its factorization.

61511232450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46899 (or 46894 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 61511232450 its reverse (5423211516), we get a palindrome (66934443966).

The spelling of 61511232450 in words is "sixty-one billion, five hundred eleven million, two hundred thirty-two thousand, four hundred fifty".