139022401642 has 4 divisors (see below), whose sum is σ = 208533602466. Its totient is φ = 69511200820.

The previous prime is 139022401619. The next prime is 139022401643. The reversal of 139022401642 is 246104220931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246104220931 = 15629 ⋅15746639.

It can be written as a sum of positive squares in only one way, i.e., 136124840401 + 2897561241 = 368951^2 + 53829^2 .

It is a junction number, because it is equal to n+sod(n) for n = 139022401598 and 139022401607.

It is not an unprimeable number, because it can be changed into a prime (139022401643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34755600409 + ... + 34755600412.

Almost surely, 2^139022401642 is an apocalyptic number.

139022401642 is a deficient number, since it is larger than the sum of its proper divisors (69511200824).

139022401642 is an equidigital number, since it uses as much as digits as its factorization.

139022401642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69511200823.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 139022401642 in words is "one hundred thirty-nine billion, twenty-two million, four hundred one thousand, six hundred forty-two".